MCQ
The atomic number of an element represents
- ANumber of neutrons in the nucleus
- ✓Number of protons in the nucleus
- CAtomic weight of element
- DValency of element
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[Use mass of electron $\left.=9.1 \times 10^{-31}\, \mathrm{~kg}, \mathrm{~h}=6.63 \times 10^{-34}\, \mathrm{~J} \mathrm{~s}, \pi=3.14\right]$
